Commit | Line | Data |
---|---|---|
2a519311 JB |
1 | /* |
2 | * cfg80211 scan result handling | |
3 | * | |
4 | * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> | |
5 | */ | |
6 | #include <linux/kernel.h> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
2a519311 JB |
8 | #include <linux/module.h> |
9 | #include <linux/netdevice.h> | |
10 | #include <linux/wireless.h> | |
11 | #include <linux/nl80211.h> | |
12 | #include <linux/etherdevice.h> | |
13 | #include <net/arp.h> | |
14 | #include <net/cfg80211.h> | |
262eb9b2 | 15 | #include <net/cfg80211-wext.h> |
2a519311 JB |
16 | #include <net/iw_handler.h> |
17 | #include "core.h" | |
18 | #include "nl80211.h" | |
a9a11622 | 19 | #include "wext-compat.h" |
e35e4d28 | 20 | #include "rdev-ops.h" |
2a519311 | 21 | |
f9616e0f | 22 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 23 | |
e8e27c66 AK |
24 | static void bss_release(struct kref *ref) |
25 | { | |
9caf0364 | 26 | struct cfg80211_bss_ies *ies; |
e8e27c66 AK |
27 | struct cfg80211_internal_bss *bss; |
28 | ||
29 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
b629ea3d JB |
30 | |
31 | if (WARN_ON(atomic_read(&bss->hold))) | |
32 | return; | |
33 | ||
e8e27c66 AK |
34 | if (bss->pub.free_priv) |
35 | bss->pub.free_priv(&bss->pub); | |
36 | ||
9caf0364 JB |
37 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
38 | if (ies) | |
39 | kfree_rcu(ies, rcu_head); | |
40 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
41 | if (ies) | |
42 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 43 | |
e8e27c66 AK |
44 | kfree(bss); |
45 | } | |
46 | ||
47 | /* must hold dev->bss_lock! */ | |
48 | static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev, | |
49 | struct cfg80211_internal_bss *bss) | |
50 | { | |
51 | list_del_init(&bss->list); | |
52 | rb_erase(&bss->rbn, &dev->bss_tree); | |
53 | kref_put(&bss->ref, bss_release); | |
54 | } | |
55 | ||
15d6030b SL |
56 | /* must hold dev->bss_lock! */ |
57 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev, | |
58 | unsigned long expire_time) | |
59 | { | |
60 | struct cfg80211_internal_bss *bss, *tmp; | |
61 | bool expired = false; | |
62 | ||
63 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
64 | if (atomic_read(&bss->hold)) | |
65 | continue; | |
66 | if (!time_after(expire_time, bss->ts)) | |
67 | continue; | |
68 | ||
69 | __cfg80211_unlink_bss(dev, bss); | |
70 | expired = true; | |
71 | } | |
72 | ||
73 | if (expired) | |
74 | dev->bss_generation++; | |
75 | } | |
76 | ||
01a0ac41 | 77 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) |
2a519311 | 78 | { |
667503dd | 79 | struct cfg80211_scan_request *request; |
fd014284 | 80 | struct wireless_dev *wdev; |
3d23e349 | 81 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
82 | union iwreq_data wrqu; |
83 | #endif | |
84 | ||
01a0ac41 JB |
85 | ASSERT_RDEV_LOCK(rdev); |
86 | ||
667503dd JB |
87 | request = rdev->scan_req; |
88 | ||
01a0ac41 JB |
89 | if (!request) |
90 | return; | |
91 | ||
fd014284 | 92 | wdev = request->wdev; |
2a519311 | 93 | |
6829c878 JB |
94 | /* |
95 | * This must be before sending the other events! | |
96 | * Otherwise, wpa_supplicant gets completely confused with | |
97 | * wext events. | |
98 | */ | |
fd014284 JB |
99 | if (wdev->netdev) |
100 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 101 | |
15d6030b | 102 | if (request->aborted) { |
fd014284 | 103 | nl80211_send_scan_aborted(rdev, wdev); |
15d6030b SL |
104 | } else { |
105 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
106 | /* flush entries from previous scans */ | |
107 | spin_lock_bh(&rdev->bss_lock); | |
108 | __cfg80211_bss_expire(rdev, request->scan_start); | |
109 | spin_unlock_bh(&rdev->bss_lock); | |
110 | } | |
fd014284 | 111 | nl80211_send_scan_done(rdev, wdev); |
15d6030b | 112 | } |
2a519311 | 113 | |
3d23e349 | 114 | #ifdef CONFIG_CFG80211_WEXT |
fd014284 | 115 | if (wdev->netdev && !request->aborted) { |
2a519311 JB |
116 | memset(&wrqu, 0, sizeof(wrqu)); |
117 | ||
fd014284 | 118 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
119 | } |
120 | #endif | |
121 | ||
fd014284 JB |
122 | if (wdev->netdev) |
123 | dev_put(wdev->netdev); | |
2a519311 | 124 | |
36e6fea8 | 125 | rdev->scan_req = NULL; |
01a0ac41 JB |
126 | |
127 | /* | |
128 | * OK. If this is invoked with "leak" then we can't | |
129 | * free this ... but we've cleaned it up anyway. The | |
130 | * driver failed to call the scan_done callback, so | |
131 | * all bets are off, it might still be trying to use | |
132 | * the scan request or not ... if it accesses the dev | |
133 | * in there (it shouldn't anyway) then it may crash. | |
134 | */ | |
135 | if (!leak) | |
136 | kfree(request); | |
2a519311 | 137 | } |
667503dd | 138 | |
36e6fea8 JB |
139 | void __cfg80211_scan_done(struct work_struct *wk) |
140 | { | |
141 | struct cfg80211_registered_device *rdev; | |
142 | ||
143 | rdev = container_of(wk, struct cfg80211_registered_device, | |
144 | scan_done_wk); | |
145 | ||
146 | cfg80211_lock_rdev(rdev); | |
01a0ac41 | 147 | ___cfg80211_scan_done(rdev, false); |
36e6fea8 JB |
148 | cfg80211_unlock_rdev(rdev); |
149 | } | |
150 | ||
667503dd JB |
151 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
152 | { | |
4ee3e063 | 153 | trace_cfg80211_scan_done(request, aborted); |
667503dd JB |
154 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
155 | ||
156 | request->aborted = aborted; | |
e60d7443 | 157 | queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); |
667503dd | 158 | } |
2a519311 JB |
159 | EXPORT_SYMBOL(cfg80211_scan_done); |
160 | ||
807f8a8c LC |
161 | void __cfg80211_sched_scan_results(struct work_struct *wk) |
162 | { | |
163 | struct cfg80211_registered_device *rdev; | |
15d6030b | 164 | struct cfg80211_sched_scan_request *request; |
807f8a8c LC |
165 | |
166 | rdev = container_of(wk, struct cfg80211_registered_device, | |
167 | sched_scan_results_wk); | |
168 | ||
15d6030b SL |
169 | request = rdev->sched_scan_req; |
170 | ||
c10841ca | 171 | mutex_lock(&rdev->sched_scan_mtx); |
807f8a8c LC |
172 | |
173 | /* we don't have sched_scan_req anymore if the scan is stopping */ | |
15d6030b SL |
174 | if (request) { |
175 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
176 | /* flush entries from previous scans */ | |
177 | spin_lock_bh(&rdev->bss_lock); | |
178 | __cfg80211_bss_expire(rdev, request->scan_start); | |
179 | spin_unlock_bh(&rdev->bss_lock); | |
180 | request->scan_start = | |
181 | jiffies + msecs_to_jiffies(request->interval); | |
182 | } | |
183 | nl80211_send_sched_scan_results(rdev, request->dev); | |
184 | } | |
807f8a8c | 185 | |
c10841ca | 186 | mutex_unlock(&rdev->sched_scan_mtx); |
807f8a8c LC |
187 | } |
188 | ||
189 | void cfg80211_sched_scan_results(struct wiphy *wiphy) | |
190 | { | |
4ee3e063 | 191 | trace_cfg80211_sched_scan_results(wiphy); |
807f8a8c LC |
192 | /* ignore if we're not scanning */ |
193 | if (wiphy_to_dev(wiphy)->sched_scan_req) | |
194 | queue_work(cfg80211_wq, | |
195 | &wiphy_to_dev(wiphy)->sched_scan_results_wk); | |
196 | } | |
197 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
198 | ||
85a9994a | 199 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) |
807f8a8c | 200 | { |
85a9994a | 201 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); |
807f8a8c | 202 | |
4ee3e063 BL |
203 | trace_cfg80211_sched_scan_stopped(wiphy); |
204 | ||
c10841ca | 205 | mutex_lock(&rdev->sched_scan_mtx); |
807f8a8c | 206 | __cfg80211_stop_sched_scan(rdev, true); |
c10841ca | 207 | mutex_unlock(&rdev->sched_scan_mtx); |
807f8a8c | 208 | } |
807f8a8c LC |
209 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
210 | ||
211 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, | |
212 | bool driver_initiated) | |
213 | { | |
807f8a8c LC |
214 | struct net_device *dev; |
215 | ||
c10841ca | 216 | lockdep_assert_held(&rdev->sched_scan_mtx); |
807f8a8c LC |
217 | |
218 | if (!rdev->sched_scan_req) | |
1a84ff75 | 219 | return -ENOENT; |
807f8a8c LC |
220 | |
221 | dev = rdev->sched_scan_req->dev; | |
222 | ||
85a9994a | 223 | if (!driver_initiated) { |
e35e4d28 | 224 | int err = rdev_sched_scan_stop(rdev, dev); |
85a9994a LC |
225 | if (err) |
226 | return err; | |
227 | } | |
807f8a8c LC |
228 | |
229 | nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); | |
230 | ||
231 | kfree(rdev->sched_scan_req); | |
232 | rdev->sched_scan_req = NULL; | |
233 | ||
3b4670ff | 234 | return 0; |
807f8a8c LC |
235 | } |
236 | ||
cb3a8eec DW |
237 | /* must hold dev->bss_lock! */ |
238 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, | |
239 | unsigned long age_secs) | |
240 | { | |
241 | struct cfg80211_internal_bss *bss; | |
242 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
243 | ||
915de2ff | 244 | list_for_each_entry(bss, &dev->bss_list, list) |
cb3a8eec | 245 | bss->ts -= age_jiffies; |
cb3a8eec DW |
246 | } |
247 | ||
2a519311 JB |
248 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) |
249 | { | |
15d6030b | 250 | __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
251 | } |
252 | ||
c21dbf92 | 253 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
2a519311 | 254 | { |
c21dbf92 | 255 | while (len > 2 && ies[0] != eid) { |
2a519311 JB |
256 | len -= ies[1] + 2; |
257 | ies += ies[1] + 2; | |
258 | } | |
259 | if (len < 2) | |
260 | return NULL; | |
261 | if (len < 2 + ies[1]) | |
262 | return NULL; | |
263 | return ies; | |
264 | } | |
c21dbf92 | 265 | EXPORT_SYMBOL(cfg80211_find_ie); |
2a519311 | 266 | |
0c28ec58 EP |
267 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, |
268 | const u8 *ies, int len) | |
269 | { | |
270 | struct ieee80211_vendor_ie *ie; | |
271 | const u8 *pos = ies, *end = ies + len; | |
272 | int ie_oui; | |
273 | ||
274 | while (pos < end) { | |
275 | pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, | |
276 | end - pos); | |
277 | if (!pos) | |
278 | return NULL; | |
279 | ||
280 | if (end - pos < sizeof(*ie)) | |
281 | return NULL; | |
282 | ||
283 | ie = (struct ieee80211_vendor_ie *)pos; | |
284 | ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; | |
285 | if (ie_oui == oui && ie->oui_type == oui_type) | |
286 | return pos; | |
287 | ||
288 | pos += 2 + ie->len; | |
289 | } | |
290 | return NULL; | |
291 | } | |
292 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); | |
293 | ||
9caf0364 | 294 | static int cmp_ies(u8 num, const u8 *ies1, int len1, const u8 *ies2, int len2) |
2a519311 | 295 | { |
c21dbf92 JB |
296 | const u8 *ie1 = cfg80211_find_ie(num, ies1, len1); |
297 | const u8 *ie2 = cfg80211_find_ie(num, ies2, len2); | |
2a519311 | 298 | |
3b6ef633 | 299 | /* equal if both missing */ |
2a519311 JB |
300 | if (!ie1 && !ie2) |
301 | return 0; | |
3b6ef633 JB |
302 | /* sort missing IE before (left of) present IE */ |
303 | if (!ie1) | |
2a519311 | 304 | return -1; |
3b6ef633 JB |
305 | if (!ie2) |
306 | return 1; | |
2a519311 | 307 | |
3b6ef633 JB |
308 | /* sort by length first, then by contents */ |
309 | if (ie1[1] != ie2[1]) | |
2a519311 | 310 | return ie2[1] - ie1[1]; |
3b6ef633 | 311 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
2a519311 JB |
312 | } |
313 | ||
915de2ff | 314 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
2a519311 JB |
315 | const u8 *ssid, size_t ssid_len) |
316 | { | |
9caf0364 | 317 | const struct cfg80211_bss_ies *ies; |
2a519311 JB |
318 | const u8 *ssidie; |
319 | ||
ac422d3c | 320 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
2a519311 JB |
321 | return false; |
322 | ||
79420f09 JB |
323 | if (!ssid) |
324 | return true; | |
325 | ||
9caf0364 JB |
326 | ies = rcu_access_pointer(a->ies); |
327 | if (!ies) | |
328 | return false; | |
329 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
2a519311 JB |
330 | if (!ssidie) |
331 | return false; | |
332 | if (ssidie[1] != ssid_len) | |
333 | return false; | |
334 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
335 | } | |
336 | ||
333ba732 EP |
337 | static bool is_mesh_bss(struct cfg80211_bss *a) |
338 | { | |
9caf0364 | 339 | const struct cfg80211_bss_ies *ies; |
333ba732 EP |
340 | const u8 *ie; |
341 | ||
342 | if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) | |
343 | return false; | |
344 | ||
9caf0364 JB |
345 | ies = rcu_access_pointer(a->ies); |
346 | if (!ies) | |
347 | return false; | |
348 | ||
349 | ie = cfg80211_find_ie(WLAN_EID_MESH_ID, ies->data, ies->len); | |
333ba732 EP |
350 | if (!ie) |
351 | return false; | |
352 | ||
9caf0364 | 353 | ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, ies->data, ies->len); |
333ba732 EP |
354 | if (!ie) |
355 | return false; | |
356 | ||
357 | return true; | |
358 | } | |
359 | ||
2a519311 JB |
360 | static bool is_mesh(struct cfg80211_bss *a, |
361 | const u8 *meshid, size_t meshidlen, | |
362 | const u8 *meshcfg) | |
363 | { | |
9caf0364 | 364 | const struct cfg80211_bss_ies *ies; |
2a519311 JB |
365 | const u8 *ie; |
366 | ||
333ba732 | 367 | if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
2a519311 JB |
368 | return false; |
369 | ||
9caf0364 JB |
370 | ies = rcu_access_pointer(a->ies); |
371 | if (!ies) | |
372 | return false; | |
373 | ||
374 | ie = cfg80211_find_ie(WLAN_EID_MESH_ID, ies->data, ies->len); | |
2a519311 JB |
375 | if (!ie) |
376 | return false; | |
377 | if (ie[1] != meshidlen) | |
378 | return false; | |
379 | if (memcmp(ie + 2, meshid, meshidlen)) | |
380 | return false; | |
381 | ||
9caf0364 | 382 | ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, ies->data, ies->len); |
cd3468ba JB |
383 | if (!ie) |
384 | return false; | |
136cfa28 | 385 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
386 | return false; |
387 | ||
388 | /* | |
389 | * Ignore mesh capability (last two bytes of the IE) when | |
390 | * comparing since that may differ between stations taking | |
391 | * part in the same mesh. | |
392 | */ | |
136cfa28 | 393 | return memcmp(ie + 2, meshcfg, |
915de2ff | 394 | sizeof(struct ieee80211_meshconf_ie) - 2) == 0; |
2a519311 JB |
395 | } |
396 | ||
915de2ff | 397 | static int cmp_bss_core(struct cfg80211_bss *a, struct cfg80211_bss *b) |
2a519311 | 398 | { |
9caf0364 | 399 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
2a519311 JB |
400 | int r; |
401 | ||
402 | if (a->channel != b->channel) | |
403 | return b->channel->center_freq - a->channel->center_freq; | |
404 | ||
333ba732 | 405 | if (is_mesh_bss(a) && is_mesh_bss(b)) { |
9caf0364 JB |
406 | a_ies = rcu_access_pointer(a->ies); |
407 | if (!a_ies) | |
408 | return -1; | |
409 | b_ies = rcu_access_pointer(b->ies); | |
410 | if (!b_ies) | |
411 | return 1; | |
412 | ||
2a519311 | 413 | r = cmp_ies(WLAN_EID_MESH_ID, |
9caf0364 JB |
414 | a_ies->data, a_ies->len, |
415 | b_ies->data, b_ies->len); | |
2a519311 JB |
416 | if (r) |
417 | return r; | |
418 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
9caf0364 JB |
419 | a_ies->data, a_ies->len, |
420 | b_ies->data, b_ies->len); | |
2a519311 JB |
421 | } |
422 | ||
ef9456a8 EG |
423 | /* |
424 | * we can't use compare_ether_addr here since we need a < > operator. | |
425 | * The binary return value of compare_ether_addr isn't enough | |
426 | */ | |
427 | return memcmp(a->bssid, b->bssid, sizeof(a->bssid)); | |
dd9dfb9f DT |
428 | } |
429 | ||
430 | static int cmp_bss(struct cfg80211_bss *a, | |
431 | struct cfg80211_bss *b) | |
432 | { | |
9caf0364 | 433 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
dd9dfb9f DT |
434 | int r; |
435 | ||
436 | r = cmp_bss_core(a, b); | |
0a35d36d JC |
437 | if (r) |
438 | return r; | |
439 | ||
9caf0364 JB |
440 | a_ies = rcu_access_pointer(a->ies); |
441 | if (!a_ies) | |
442 | return -1; | |
443 | b_ies = rcu_access_pointer(b->ies); | |
444 | if (!b_ies) | |
445 | return 1; | |
446 | ||
2a519311 | 447 | return cmp_ies(WLAN_EID_SSID, |
9caf0364 JB |
448 | a_ies->data, a_ies->len, |
449 | b_ies->data, b_ies->len); | |
2a519311 JB |
450 | } |
451 | ||
915de2ff | 452 | static int cmp_hidden_bss(struct cfg80211_bss *a, struct cfg80211_bss *b) |
dd9dfb9f | 453 | { |
9caf0364 | 454 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
dd9dfb9f DT |
455 | const u8 *ie1; |
456 | const u8 *ie2; | |
457 | int i; | |
458 | int r; | |
459 | ||
460 | r = cmp_bss_core(a, b); | |
461 | if (r) | |
462 | return r; | |
463 | ||
9caf0364 JB |
464 | a_ies = rcu_access_pointer(a->ies); |
465 | if (!a_ies) | |
466 | return -1; | |
467 | b_ies = rcu_access_pointer(b->ies); | |
468 | if (!b_ies) | |
469 | return 1; | |
470 | ||
471 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); | |
472 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 473 | |
f94f8b16 JB |
474 | /* |
475 | * Key comparator must use same algorithm in any rb-tree | |
dd9dfb9f DT |
476 | * search function (order is important), otherwise ordering |
477 | * of items in the tree is broken and search gives incorrect | |
f94f8b16 JB |
478 | * results. This code uses same order as cmp_ies() does. |
479 | * | |
480 | * Note that due to the differring behaviour with hidden SSIDs | |
481 | * this function only works when "b" is the tree element and | |
482 | * "a" is the key we're looking for. | |
483 | */ | |
dd9dfb9f DT |
484 | |
485 | /* sort missing IE before (left of) present IE */ | |
486 | if (!ie1) | |
487 | return -1; | |
488 | if (!ie2) | |
489 | return 1; | |
490 | ||
491 | /* zero-size SSID is used as an indication of the hidden bss */ | |
492 | if (!ie2[1]) | |
493 | return 0; | |
494 | ||
495 | /* sort by length first, then by contents */ | |
496 | if (ie1[1] != ie2[1]) | |
497 | return ie2[1] - ie1[1]; | |
498 | ||
f94f8b16 JB |
499 | /* |
500 | * zeroed SSID ie is another indication of a hidden bss; | |
501 | * if it isn't zeroed just return the regular sort value | |
502 | * to find the next candidate | |
503 | */ | |
dd9dfb9f DT |
504 | for (i = 0; i < ie2[1]; i++) |
505 | if (ie2[i + 2]) | |
f94f8b16 | 506 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
dd9dfb9f DT |
507 | |
508 | return 0; | |
509 | } | |
510 | ||
2a519311 JB |
511 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
512 | struct ieee80211_channel *channel, | |
513 | const u8 *bssid, | |
79420f09 JB |
514 | const u8 *ssid, size_t ssid_len, |
515 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
516 | { |
517 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
518 | struct cfg80211_internal_bss *bss, *res = NULL; | |
ccb6c136 | 519 | unsigned long now = jiffies; |
2a519311 | 520 | |
4ee3e063 BL |
521 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask, |
522 | capa_val); | |
523 | ||
2a519311 JB |
524 | spin_lock_bh(&dev->bss_lock); |
525 | ||
526 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
527 | if ((bss->pub.capability & capa_mask) != capa_val) |
528 | continue; | |
2a519311 JB |
529 | if (channel && bss->pub.channel != channel) |
530 | continue; | |
ccb6c136 JB |
531 | /* Don't get expired BSS structs */ |
532 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
533 | !atomic_read(&bss->hold)) | |
534 | continue; | |
2a519311 JB |
535 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
536 | res = bss; | |
537 | kref_get(&res->ref); | |
538 | break; | |
539 | } | |
540 | } | |
541 | ||
542 | spin_unlock_bh(&dev->bss_lock); | |
543 | if (!res) | |
544 | return NULL; | |
4ee3e063 | 545 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
546 | return &res->pub; |
547 | } | |
548 | EXPORT_SYMBOL(cfg80211_get_bss); | |
549 | ||
550 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
551 | struct ieee80211_channel *channel, | |
552 | const u8 *meshid, size_t meshidlen, | |
553 | const u8 *meshcfg) | |
554 | { | |
555 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
556 | struct cfg80211_internal_bss *bss, *res = NULL; | |
557 | ||
558 | spin_lock_bh(&dev->bss_lock); | |
559 | ||
560 | list_for_each_entry(bss, &dev->bss_list, list) { | |
561 | if (channel && bss->pub.channel != channel) | |
562 | continue; | |
563 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
564 | res = bss; | |
565 | kref_get(&res->ref); | |
566 | break; | |
567 | } | |
568 | } | |
569 | ||
570 | spin_unlock_bh(&dev->bss_lock); | |
571 | if (!res) | |
572 | return NULL; | |
573 | return &res->pub; | |
574 | } | |
575 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
576 | ||
577 | ||
578 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
579 | struct cfg80211_internal_bss *bss) | |
580 | { | |
581 | struct rb_node **p = &dev->bss_tree.rb_node; | |
582 | struct rb_node *parent = NULL; | |
583 | struct cfg80211_internal_bss *tbss; | |
584 | int cmp; | |
585 | ||
586 | while (*p) { | |
587 | parent = *p; | |
588 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
589 | ||
590 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
591 | ||
592 | if (WARN_ON(!cmp)) { | |
593 | /* will sort of leak this BSS */ | |
594 | return; | |
595 | } | |
596 | ||
597 | if (cmp < 0) | |
598 | p = &(*p)->rb_left; | |
599 | else | |
600 | p = &(*p)->rb_right; | |
601 | } | |
602 | ||
603 | rb_link_node(&bss->rbn, parent, p); | |
604 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
605 | } | |
606 | ||
607 | static struct cfg80211_internal_bss * | |
608 | rb_find_bss(struct cfg80211_registered_device *dev, | |
609 | struct cfg80211_internal_bss *res) | |
610 | { | |
611 | struct rb_node *n = dev->bss_tree.rb_node; | |
612 | struct cfg80211_internal_bss *bss; | |
613 | int r; | |
614 | ||
615 | while (n) { | |
616 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
617 | r = cmp_bss(&res->pub, &bss->pub); | |
618 | ||
619 | if (r == 0) | |
620 | return bss; | |
621 | else if (r < 0) | |
622 | n = n->rb_left; | |
623 | else | |
624 | n = n->rb_right; | |
625 | } | |
626 | ||
627 | return NULL; | |
628 | } | |
629 | ||
dd9dfb9f DT |
630 | static struct cfg80211_internal_bss * |
631 | rb_find_hidden_bss(struct cfg80211_registered_device *dev, | |
915de2ff | 632 | struct cfg80211_internal_bss *res) |
dd9dfb9f DT |
633 | { |
634 | struct rb_node *n = dev->bss_tree.rb_node; | |
635 | struct cfg80211_internal_bss *bss; | |
636 | int r; | |
637 | ||
638 | while (n) { | |
639 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
640 | r = cmp_hidden_bss(&res->pub, &bss->pub); | |
641 | ||
642 | if (r == 0) | |
643 | return bss; | |
644 | else if (r < 0) | |
645 | n = n->rb_left; | |
646 | else | |
647 | n = n->rb_right; | |
648 | } | |
649 | ||
650 | return NULL; | |
651 | } | |
652 | ||
653 | static void | |
654 | copy_hidden_ies(struct cfg80211_internal_bss *res, | |
915de2ff | 655 | struct cfg80211_internal_bss *hidden) |
dd9dfb9f | 656 | { |
9caf0364 JB |
657 | const struct cfg80211_bss_ies *ies; |
658 | ||
659 | if (rcu_access_pointer(res->pub.beacon_ies)) | |
dd9dfb9f DT |
660 | return; |
661 | ||
9caf0364 JB |
662 | ies = rcu_access_pointer(hidden->pub.beacon_ies); |
663 | if (WARN_ON(!ies)) | |
dd9dfb9f DT |
664 | return; |
665 | ||
9caf0364 JB |
666 | ies = kmemdup(ies, sizeof(*ies) + ies->len, GFP_ATOMIC); |
667 | if (unlikely(!ies)) | |
668 | return; | |
669 | rcu_assign_pointer(res->pub.beacon_ies, ies); | |
dd9dfb9f DT |
670 | } |
671 | ||
2a519311 JB |
672 | static struct cfg80211_internal_bss * |
673 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
9caf0364 | 674 | struct cfg80211_internal_bss *tmp) |
2a519311 JB |
675 | { |
676 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 677 | |
9caf0364 | 678 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 679 | return NULL; |
2a519311 | 680 | |
9caf0364 | 681 | tmp->ts = jiffies; |
2a519311 | 682 | |
2a519311 JB |
683 | spin_lock_bh(&dev->bss_lock); |
684 | ||
9caf0364 JB |
685 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
686 | spin_unlock_bh(&dev->bss_lock); | |
687 | return NULL; | |
688 | } | |
689 | ||
690 | found = rb_find_bss(dev, tmp); | |
2a519311 | 691 | |
cd1658f5 | 692 | if (found) { |
9caf0364 JB |
693 | found->pub.beacon_interval = tmp->pub.beacon_interval; |
694 | found->pub.tsf = tmp->pub.tsf; | |
695 | found->pub.signal = tmp->pub.signal; | |
696 | found->pub.capability = tmp->pub.capability; | |
697 | found->ts = tmp->ts; | |
cd1658f5 | 698 | |
34a6eddb | 699 | /* Update IEs */ |
9caf0364 JB |
700 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
701 | const struct cfg80211_bss_ies *old; | |
702 | ||
703 | old = rcu_access_pointer(found->pub.proberesp_ies); | |
cd1658f5 | 704 | |
9caf0364 JB |
705 | rcu_assign_pointer(found->pub.proberesp_ies, |
706 | tmp->pub.proberesp_ies); | |
34a6eddb | 707 | /* Override possible earlier Beacon frame IEs */ |
9caf0364 JB |
708 | rcu_assign_pointer(found->pub.ies, |
709 | tmp->pub.proberesp_ies); | |
710 | if (old) | |
711 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
712 | rcu_head); | |
713 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { | |
714 | const struct cfg80211_bss_ies *old, *ies; | |
915de2ff | 715 | |
9caf0364 JB |
716 | old = rcu_access_pointer(found->pub.beacon_ies); |
717 | ies = rcu_access_pointer(found->pub.ies); | |
718 | ||
719 | rcu_assign_pointer(found->pub.beacon_ies, | |
720 | tmp->pub.beacon_ies); | |
01123e23 SN |
721 | |
722 | /* Override IEs if they were from a beacon before */ | |
9caf0364 JB |
723 | if (old == ies) |
724 | rcu_assign_pointer(found->pub.ies, | |
725 | tmp->pub.beacon_ies); | |
cd1658f5 | 726 | |
9caf0364 JB |
727 | if (old) |
728 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
729 | rcu_head); | |
730 | } | |
2a519311 | 731 | } else { |
9caf0364 | 732 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 733 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 734 | struct cfg80211_bss_ies *ies; |
dd9dfb9f DT |
735 | |
736 | /* First check if the beacon is a probe response from | |
737 | * a hidden bss. If so, copy beacon ies (with nullified | |
738 | * ssid) into the probe response bss entry (with real ssid). | |
739 | * It is required basically for PSM implementation | |
740 | * (probe responses do not contain tim ie) */ | |
741 | ||
742 | /* TODO: The code is not trying to update existing probe | |
743 | * response bss entries when beacon ies are | |
744 | * getting changed. */ | |
9caf0364 | 745 | hidden = rb_find_hidden_bss(dev, tmp); |
dd9dfb9f | 746 | if (hidden) |
9caf0364 JB |
747 | copy_hidden_ies(tmp, hidden); |
748 | ||
749 | /* | |
750 | * create a copy -- the "res" variable that is passed in | |
751 | * is allocated on the stack since it's not needed in the | |
752 | * more common case of an update | |
753 | */ | |
754 | new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size, | |
755 | GFP_ATOMIC); | |
756 | if (!new) { | |
757 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
758 | if (ies) | |
759 | kfree_rcu(ies, rcu_head); | |
760 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
761 | if (ies) | |
762 | kfree_rcu(ies, rcu_head); | |
763 | spin_unlock_bh(&dev->bss_lock); | |
764 | return NULL; | |
765 | } | |
766 | memcpy(new, tmp, sizeof(*new)); | |
767 | kref_init(&new->ref); | |
768 | list_add_tail(&new->list, &dev->bss_list); | |
769 | rb_insert_bss(dev, new); | |
770 | found = new; | |
2a519311 JB |
771 | } |
772 | ||
773 | dev->bss_generation++; | |
774 | spin_unlock_bh(&dev->bss_lock); | |
775 | ||
776 | kref_get(&found->ref); | |
777 | return found; | |
778 | } | |
779 | ||
0172bb75 JB |
780 | static struct ieee80211_channel * |
781 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
782 | struct ieee80211_channel *channel) | |
783 | { | |
784 | const u8 *tmp; | |
785 | u32 freq; | |
786 | int channel_number = -1; | |
787 | ||
788 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
789 | if (tmp && tmp[1] == 1) { | |
790 | channel_number = tmp[2]; | |
791 | } else { | |
792 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
793 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
794 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
795 | ||
796 | channel_number = htop->primary_chan; | |
797 | } | |
798 | } | |
799 | ||
800 | if (channel_number < 0) | |
801 | return channel; | |
802 | ||
803 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
804 | channel = ieee80211_get_channel(wiphy, freq); | |
805 | if (!channel) | |
806 | return NULL; | |
807 | if (channel->flags & IEEE80211_CHAN_DISABLED) | |
808 | return NULL; | |
809 | return channel; | |
810 | } | |
811 | ||
06aa7afa JK |
812 | struct cfg80211_bss* |
813 | cfg80211_inform_bss(struct wiphy *wiphy, | |
814 | struct ieee80211_channel *channel, | |
7b8bcff2 JB |
815 | const u8 *bssid, u64 tsf, u16 capability, |
816 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
06aa7afa JK |
817 | s32 signal, gfp_t gfp) |
818 | { | |
9caf0364 JB |
819 | struct cfg80211_bss_ies *ies; |
820 | struct cfg80211_internal_bss tmp = {}, *res; | |
06aa7afa JK |
821 | |
822 | if (WARN_ON(!wiphy)) | |
823 | return NULL; | |
824 | ||
22fe88d3 | 825 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
06aa7afa JK |
826 | (signal < 0 || signal > 100))) |
827 | return NULL; | |
828 | ||
0172bb75 JB |
829 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel); |
830 | if (!channel) | |
831 | return NULL; | |
832 | ||
9caf0364 JB |
833 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
834 | tmp.pub.channel = channel; | |
835 | tmp.pub.signal = signal; | |
836 | tmp.pub.tsf = tsf; | |
837 | tmp.pub.beacon_interval = beacon_interval; | |
838 | tmp.pub.capability = capability; | |
34a6eddb JM |
839 | /* |
840 | * Since we do not know here whether the IEs are from a Beacon or Probe | |
841 | * Response frame, we need to pick one of the options and only use it | |
842 | * with the driver that does not provide the full Beacon/Probe Response | |
843 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
9caf0364 JB |
844 | * override the iies pointer should we have received an earlier |
845 | * indication of Probe Response data. | |
34a6eddb JM |
846 | * |
847 | * The initial buffer for the IEs is allocated with the BSS entry and | |
848 | * is located after the private area. | |
849 | */ | |
9caf0364 JB |
850 | ies = kmalloc(sizeof(*ies) + ielen, gfp); |
851 | if (!ies) | |
852 | return NULL; | |
853 | ies->len = ielen; | |
854 | memcpy(ies->data, ie, ielen); | |
06aa7afa | 855 | |
9caf0364 JB |
856 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); |
857 | rcu_assign_pointer(tmp.pub.ies, ies); | |
06aa7afa | 858 | |
9caf0364 | 859 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); |
06aa7afa JK |
860 | if (!res) |
861 | return NULL; | |
862 | ||
863 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
864 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
865 | ||
4ee3e063 | 866 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
867 | /* cfg80211_bss_update gives us a referenced result */ |
868 | return &res->pub; | |
869 | } | |
870 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
871 | ||
2a519311 JB |
872 | struct cfg80211_bss * |
873 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
874 | struct ieee80211_channel *channel, | |
875 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 876 | s32 signal, gfp_t gfp) |
2a519311 | 877 | { |
9caf0364 JB |
878 | struct cfg80211_internal_bss tmp = {}, *res; |
879 | struct cfg80211_bss_ies *ies; | |
2a519311 JB |
880 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
881 | u.probe_resp.variable); | |
bef9bacc | 882 | |
0172bb75 JB |
883 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
884 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
885 | ||
4ee3e063 BL |
886 | trace_cfg80211_inform_bss_frame(wiphy, channel, mgmt, len, signal); |
887 | ||
bef9bacc MK |
888 | if (WARN_ON(!mgmt)) |
889 | return NULL; | |
890 | ||
891 | if (WARN_ON(!wiphy)) | |
892 | return NULL; | |
2a519311 | 893 | |
22fe88d3 | 894 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
768be59f | 895 | (signal < 0 || signal > 100))) |
2a519311 JB |
896 | return NULL; |
897 | ||
bef9bacc | 898 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
899 | return NULL; |
900 | ||
0172bb75 JB |
901 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
902 | ielen, channel); | |
903 | if (!channel) | |
904 | return NULL; | |
905 | ||
9caf0364 JB |
906 | ies = kmalloc(sizeof(*ies) + ielen, gfp); |
907 | if (!ies) | |
2a519311 | 908 | return NULL; |
9caf0364 JB |
909 | ies->len = ielen; |
910 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); | |
2a519311 | 911 | |
9caf0364 JB |
912 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
913 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
914 | else | |
915 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
916 | rcu_assign_pointer(tmp.pub.ies, ies); | |
917 | ||
918 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); | |
919 | tmp.pub.channel = channel; | |
920 | tmp.pub.signal = signal; | |
921 | tmp.pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
922 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
923 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
924 | ||
925 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); | |
2a519311 JB |
926 | if (!res) |
927 | return NULL; | |
928 | ||
e38f8a7a LR |
929 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
930 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
931 | ||
4ee3e063 | 932 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
933 | /* cfg80211_bss_update gives us a referenced result */ |
934 | return &res->pub; | |
935 | } | |
936 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
937 | ||
4c0c0b75 JB |
938 | void cfg80211_ref_bss(struct cfg80211_bss *pub) |
939 | { | |
940 | struct cfg80211_internal_bss *bss; | |
941 | ||
942 | if (!pub) | |
943 | return; | |
944 | ||
945 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
946 | kref_get(&bss->ref); | |
947 | } | |
948 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
949 | ||
2a519311 JB |
950 | void cfg80211_put_bss(struct cfg80211_bss *pub) |
951 | { | |
952 | struct cfg80211_internal_bss *bss; | |
953 | ||
954 | if (!pub) | |
955 | return; | |
956 | ||
957 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
958 | kref_put(&bss->ref, bss_release); | |
959 | } | |
960 | EXPORT_SYMBOL(cfg80211_put_bss); | |
961 | ||
d491af19 JB |
962 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
963 | { | |
964 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
965 | struct cfg80211_internal_bss *bss; | |
966 | ||
967 | if (WARN_ON(!pub)) | |
968 | return; | |
969 | ||
970 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
971 | ||
972 | spin_lock_bh(&dev->bss_lock); | |
3207390a | 973 | if (!list_empty(&bss->list)) { |
2b78ac9b | 974 | __cfg80211_unlink_bss(dev, bss); |
3207390a | 975 | dev->bss_generation++; |
3207390a | 976 | } |
d491af19 | 977 | spin_unlock_bh(&dev->bss_lock); |
d491af19 JB |
978 | } |
979 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
980 | ||
3d23e349 | 981 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
982 | int cfg80211_wext_siwscan(struct net_device *dev, |
983 | struct iw_request_info *info, | |
984 | union iwreq_data *wrqu, char *extra) | |
985 | { | |
986 | struct cfg80211_registered_device *rdev; | |
987 | struct wiphy *wiphy; | |
988 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 989 | struct cfg80211_scan_request *creq = NULL; |
2a519311 JB |
990 | int i, err, n_channels = 0; |
991 | enum ieee80211_band band; | |
992 | ||
993 | if (!netif_running(dev)) | |
994 | return -ENETDOWN; | |
995 | ||
b2e3abdc HS |
996 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
997 | wreq = (struct iw_scan_req *)extra; | |
998 | ||
463d0183 | 999 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1000 | |
1001 | if (IS_ERR(rdev)) | |
1002 | return PTR_ERR(rdev); | |
1003 | ||
1004 | if (rdev->scan_req) { | |
1005 | err = -EBUSY; | |
1006 | goto out; | |
1007 | } | |
1008 | ||
1009 | wiphy = &rdev->wiphy; | |
1010 | ||
b2e3abdc HS |
1011 | /* Determine number of channels, needed to allocate creq */ |
1012 | if (wreq && wreq->num_channels) | |
1013 | n_channels = wreq->num_channels; | |
1014 | else { | |
1015 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
1016 | if (wiphy->bands[band]) | |
1017 | n_channels += wiphy->bands[band]->n_channels; | |
1018 | } | |
2a519311 JB |
1019 | |
1020 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
1021 | n_channels * sizeof(void *), | |
1022 | GFP_ATOMIC); | |
1023 | if (!creq) { | |
1024 | err = -ENOMEM; | |
1025 | goto out; | |
1026 | } | |
1027 | ||
1028 | creq->wiphy = wiphy; | |
fd014284 | 1029 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
1030 | /* SSIDs come after channels */ |
1031 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
1032 | creq->n_channels = n_channels; |
1033 | creq->n_ssids = 1; | |
15d6030b | 1034 | creq->scan_start = jiffies; |
2a519311 | 1035 | |
b2e3abdc | 1036 | /* translate "Scan on frequencies" request */ |
2a519311 JB |
1037 | i = 0; |
1038 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1039 | int j; | |
584991dc | 1040 | |
2a519311 JB |
1041 | if (!wiphy->bands[band]) |
1042 | continue; | |
584991dc | 1043 | |
2a519311 | 1044 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
1045 | /* ignore disabled channels */ |
1046 | if (wiphy->bands[band]->channels[j].flags & | |
1047 | IEEE80211_CHAN_DISABLED) | |
1048 | continue; | |
b2e3abdc HS |
1049 | |
1050 | /* If we have a wireless request structure and the | |
1051 | * wireless request specifies frequencies, then search | |
1052 | * for the matching hardware channel. | |
1053 | */ | |
1054 | if (wreq && wreq->num_channels) { | |
1055 | int k; | |
1056 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
1057 | for (k = 0; k < wreq->num_channels; k++) { | |
a4e7b730 | 1058 | int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); |
b2e3abdc HS |
1059 | if (wext_freq == wiphy_freq) |
1060 | goto wext_freq_found; | |
1061 | } | |
1062 | goto wext_freq_not_found; | |
1063 | } | |
1064 | ||
1065 | wext_freq_found: | |
2a519311 JB |
1066 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
1067 | i++; | |
b2e3abdc | 1068 | wext_freq_not_found: ; |
2a519311 JB |
1069 | } |
1070 | } | |
8862dc5f HS |
1071 | /* No channels found? */ |
1072 | if (!i) { | |
1073 | err = -EINVAL; | |
1074 | goto out; | |
1075 | } | |
2a519311 | 1076 | |
b2e3abdc HS |
1077 | /* Set real number of channels specified in creq->channels[] */ |
1078 | creq->n_channels = i; | |
2a519311 | 1079 | |
b2e3abdc HS |
1080 | /* translate "Scan for SSID" request */ |
1081 | if (wreq) { | |
2a519311 | 1082 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
1083 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1084 | err = -EINVAL; | |
1085 | goto out; | |
1086 | } | |
2a519311 JB |
1087 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1088 | creq->ssids[0].ssid_len = wreq->essid_len; | |
1089 | } | |
1090 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
1091 | creq->n_ssids = 0; | |
1092 | } | |
1093 | ||
34850ab2 | 1094 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) |
a401d2bb JB |
1095 | if (wiphy->bands[i]) |
1096 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 1097 | |
2a519311 | 1098 | rdev->scan_req = creq; |
e35e4d28 | 1099 | err = rdev_scan(rdev, creq); |
2a519311 JB |
1100 | if (err) { |
1101 | rdev->scan_req = NULL; | |
65486c8b | 1102 | /* creq will be freed below */ |
463d0183 | 1103 | } else { |
fd014284 | 1104 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
1105 | /* creq now owned by driver */ |
1106 | creq = NULL; | |
463d0183 JB |
1107 | dev_hold(dev); |
1108 | } | |
2a519311 | 1109 | out: |
65486c8b | 1110 | kfree(creq); |
4d0c8aea | 1111 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
1112 | return err; |
1113 | } | |
ba44cb72 | 1114 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
1115 | |
1116 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
9caf0364 | 1117 | const struct cfg80211_bss_ies *ies, |
2a519311 JB |
1118 | char **current_ev, char *end_buf) |
1119 | { | |
9caf0364 | 1120 | const u8 *pos, *end, *next; |
2a519311 JB |
1121 | struct iw_event iwe; |
1122 | ||
9caf0364 | 1123 | if (!ies) |
2a519311 JB |
1124 | return; |
1125 | ||
1126 | /* | |
1127 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1128 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1129 | */ | |
9caf0364 JB |
1130 | pos = ies->data; |
1131 | end = pos + ies->len; | |
2a519311 JB |
1132 | |
1133 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1134 | next = pos + 2 + pos[1]; | |
1135 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1136 | next = next + 2 + next[1]; | |
1137 | ||
1138 | memset(&iwe, 0, sizeof(iwe)); | |
1139 | iwe.cmd = IWEVGENIE; | |
1140 | iwe.u.data.length = next - pos; | |
1141 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
9caf0364 JB |
1142 | end_buf, &iwe, |
1143 | (void *)pos); | |
2a519311 JB |
1144 | |
1145 | pos = next; | |
1146 | } | |
1147 | ||
1148 | if (end > pos) { | |
1149 | memset(&iwe, 0, sizeof(iwe)); | |
1150 | iwe.cmd = IWEVGENIE; | |
1151 | iwe.u.data.length = end - pos; | |
1152 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
9caf0364 JB |
1153 | end_buf, &iwe, |
1154 | (void *)pos); | |
2a519311 JB |
1155 | } |
1156 | } | |
1157 | ||
cb3a8eec DW |
1158 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
1159 | { | |
1160 | unsigned long end = jiffies; | |
1161 | ||
1162 | if (end >= start) | |
1163 | return jiffies_to_msecs(end - start); | |
1164 | ||
1165 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
1166 | } | |
2a519311 JB |
1167 | |
1168 | static char * | |
77965c97 JB |
1169 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1170 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1171 | char *end_buf) | |
2a519311 | 1172 | { |
9caf0364 | 1173 | const struct cfg80211_bss_ies *ies; |
2a519311 | 1174 | struct iw_event iwe; |
9caf0364 | 1175 | const u8 *ie; |
2a519311 | 1176 | u8 *buf, *cfg, *p; |
9caf0364 | 1177 | int rem, i, sig; |
2a519311 JB |
1178 | bool ismesh = false; |
1179 | ||
1180 | memset(&iwe, 0, sizeof(iwe)); | |
1181 | iwe.cmd = SIOCGIWAP; | |
1182 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1183 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
1184 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1185 | IW_EV_ADDR_LEN); | |
1186 | ||
1187 | memset(&iwe, 0, sizeof(iwe)); | |
1188 | iwe.cmd = SIOCGIWFREQ; | |
1189 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1190 | iwe.u.freq.e = 0; | |
1191 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1192 | IW_EV_FREQ_LEN); | |
1193 | ||
1194 | memset(&iwe, 0, sizeof(iwe)); | |
1195 | iwe.cmd = SIOCGIWFREQ; | |
1196 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
1197 | iwe.u.freq.e = 6; | |
1198 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1199 | IW_EV_FREQ_LEN); | |
1200 | ||
77965c97 | 1201 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
1202 | memset(&iwe, 0, sizeof(iwe)); |
1203 | iwe.cmd = IWEVQUAL; | |
1204 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
1205 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 1206 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 1207 | switch (wiphy->signal_type) { |
2a519311 | 1208 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
1209 | sig = bss->pub.signal / 100; |
1210 | iwe.u.qual.level = sig; | |
2a519311 | 1211 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
1212 | if (sig < -110) /* rather bad */ |
1213 | sig = -110; | |
1214 | else if (sig > -40) /* perfect */ | |
1215 | sig = -40; | |
1216 | /* will give a range of 0 .. 70 */ | |
1217 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
1218 | break; |
1219 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
1220 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
1221 | /* will give range 0 .. 100 */ |
1222 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
1223 | break; |
1224 | default: | |
1225 | /* not reached */ | |
1226 | break; | |
1227 | } | |
1228 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1229 | &iwe, IW_EV_QUAL_LEN); | |
1230 | } | |
1231 | ||
1232 | memset(&iwe, 0, sizeof(iwe)); | |
1233 | iwe.cmd = SIOCGIWENCODE; | |
1234 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
1235 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
1236 | else | |
1237 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
1238 | iwe.u.data.length = 0; | |
1239 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1240 | &iwe, ""); | |
1241 | ||
9caf0364 JB |
1242 | rcu_read_lock(); |
1243 | ies = rcu_dereference(bss->pub.ies); | |
1244 | if (ies) { | |
1245 | rem = ies->len; | |
1246 | ie = ies->data; | |
1247 | } else { | |
1248 | rem = 0; | |
1249 | ie = NULL; | |
1250 | } | |
1251 | ||
1252 | while (ies && rem >= 2) { | |
2a519311 JB |
1253 | /* invalid data */ |
1254 | if (ie[1] > rem - 2) | |
1255 | break; | |
1256 | ||
1257 | switch (ie[0]) { | |
1258 | case WLAN_EID_SSID: | |
1259 | memset(&iwe, 0, sizeof(iwe)); | |
1260 | iwe.cmd = SIOCGIWESSID; | |
1261 | iwe.u.data.length = ie[1]; | |
1262 | iwe.u.data.flags = 1; | |
1263 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
9caf0364 | 1264 | &iwe, (u8 *)ie + 2); |
2a519311 JB |
1265 | break; |
1266 | case WLAN_EID_MESH_ID: | |
1267 | memset(&iwe, 0, sizeof(iwe)); | |
1268 | iwe.cmd = SIOCGIWESSID; | |
1269 | iwe.u.data.length = ie[1]; | |
1270 | iwe.u.data.flags = 1; | |
1271 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
9caf0364 | 1272 | &iwe, (u8 *)ie + 2); |
2a519311 JB |
1273 | break; |
1274 | case WLAN_EID_MESH_CONFIG: | |
1275 | ismesh = true; | |
136cfa28 | 1276 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
1277 | break; |
1278 | buf = kmalloc(50, GFP_ATOMIC); | |
1279 | if (!buf) | |
1280 | break; | |
9caf0364 | 1281 | cfg = (u8 *)ie + 2; |
2a519311 JB |
1282 | memset(&iwe, 0, sizeof(iwe)); |
1283 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
1284 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
1285 | "0x%02X", cfg[0]); | |
2a519311 JB |
1286 | iwe.u.data.length = strlen(buf); |
1287 | current_ev = iwe_stream_add_point(info, current_ev, | |
1288 | end_buf, | |
1289 | &iwe, buf); | |
76aa5e70 RP |
1290 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
1291 | cfg[1]); | |
2a519311 JB |
1292 | iwe.u.data.length = strlen(buf); |
1293 | current_ev = iwe_stream_add_point(info, current_ev, | |
1294 | end_buf, | |
1295 | &iwe, buf); | |
76aa5e70 RP |
1296 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
1297 | cfg[2]); | |
2a519311 JB |
1298 | iwe.u.data.length = strlen(buf); |
1299 | current_ev = iwe_stream_add_point(info, current_ev, | |
1300 | end_buf, | |
1301 | &iwe, buf); | |
76aa5e70 | 1302 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 JB |
1303 | iwe.u.data.length = strlen(buf); |
1304 | current_ev = iwe_stream_add_point(info, current_ev, | |
1305 | end_buf, | |
1306 | &iwe, buf); | |
76aa5e70 RP |
1307 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
1308 | iwe.u.data.length = strlen(buf); | |
1309 | current_ev = iwe_stream_add_point(info, current_ev, | |
1310 | end_buf, | |
1311 | &iwe, buf); | |
1312 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); | |
1313 | iwe.u.data.length = strlen(buf); | |
1314 | current_ev = iwe_stream_add_point(info, current_ev, | |
1315 | end_buf, | |
1316 | &iwe, buf); | |
1317 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); | |
2a519311 JB |
1318 | iwe.u.data.length = strlen(buf); |
1319 | current_ev = iwe_stream_add_point(info, current_ev, | |
1320 | end_buf, | |
1321 | &iwe, buf); | |
1322 | kfree(buf); | |
1323 | break; | |
1324 | case WLAN_EID_SUPP_RATES: | |
1325 | case WLAN_EID_EXT_SUPP_RATES: | |
1326 | /* display all supported rates in readable format */ | |
1327 | p = current_ev + iwe_stream_lcp_len(info); | |
1328 | ||
1329 | memset(&iwe, 0, sizeof(iwe)); | |
1330 | iwe.cmd = SIOCGIWRATE; | |
1331 | /* Those two flags are ignored... */ | |
1332 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
1333 | ||
1334 | for (i = 0; i < ie[1]; i++) { | |
1335 | iwe.u.bitrate.value = | |
1336 | ((ie[i + 2] & 0x7f) * 500000); | |
1337 | p = iwe_stream_add_value(info, current_ev, p, | |
1338 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
1339 | } | |
1340 | current_ev = p; | |
1341 | break; | |
1342 | } | |
1343 | rem -= ie[1] + 2; | |
1344 | ie += ie[1] + 2; | |
1345 | } | |
1346 | ||
f64f9e71 JP |
1347 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1348 | ismesh) { | |
2a519311 JB |
1349 | memset(&iwe, 0, sizeof(iwe)); |
1350 | iwe.cmd = SIOCGIWMODE; | |
1351 | if (ismesh) | |
1352 | iwe.u.mode = IW_MODE_MESH; | |
1353 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1354 | iwe.u.mode = IW_MODE_MASTER; | |
1355 | else | |
1356 | iwe.u.mode = IW_MODE_ADHOC; | |
1357 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1358 | &iwe, IW_EV_UINT_LEN); | |
1359 | } | |
1360 | ||
1361 | buf = kmalloc(30, GFP_ATOMIC); | |
1362 | if (buf) { | |
1363 | memset(&iwe, 0, sizeof(iwe)); | |
1364 | iwe.cmd = IWEVCUSTOM; | |
1365 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
1366 | iwe.u.data.length = strlen(buf); | |
1367 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1368 | &iwe, buf); | |
1369 | memset(&iwe, 0, sizeof(iwe)); | |
1370 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
1371 | sprintf(buf, " Last beacon: %ums ago", |
1372 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
1373 | iwe.u.data.length = strlen(buf); |
1374 | current_ev = iwe_stream_add_point(info, current_ev, | |
1375 | end_buf, &iwe, buf); | |
1376 | kfree(buf); | |
1377 | } | |
1378 | ||
9caf0364 JB |
1379 | ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf); |
1380 | rcu_read_unlock(); | |
2a519311 JB |
1381 | |
1382 | return current_ev; | |
1383 | } | |
1384 | ||
1385 | ||
1386 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
1387 | struct iw_request_info *info, | |
1388 | char *buf, size_t len) | |
1389 | { | |
1390 | char *current_ev = buf; | |
1391 | char *end_buf = buf + len; | |
1392 | struct cfg80211_internal_bss *bss; | |
1393 | ||
1394 | spin_lock_bh(&dev->bss_lock); | |
1395 | cfg80211_bss_expire(dev); | |
1396 | ||
1397 | list_for_each_entry(bss, &dev->bss_list, list) { | |
1398 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
1399 | spin_unlock_bh(&dev->bss_lock); | |
1400 | return -E2BIG; | |
1401 | } | |
77965c97 JB |
1402 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
1403 | current_ev, end_buf); | |
2a519311 JB |
1404 | } |
1405 | spin_unlock_bh(&dev->bss_lock); | |
1406 | return current_ev - buf; | |
1407 | } | |
1408 | ||
1409 | ||
1410 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1411 | struct iw_request_info *info, | |
1412 | struct iw_point *data, char *extra) | |
1413 | { | |
1414 | struct cfg80211_registered_device *rdev; | |
1415 | int res; | |
1416 | ||
1417 | if (!netif_running(dev)) | |
1418 | return -ENETDOWN; | |
1419 | ||
463d0183 | 1420 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1421 | |
1422 | if (IS_ERR(rdev)) | |
1423 | return PTR_ERR(rdev); | |
1424 | ||
1425 | if (rdev->scan_req) { | |
1426 | res = -EAGAIN; | |
1427 | goto out; | |
1428 | } | |
1429 | ||
1430 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1431 | data->length = 0; | |
1432 | if (res >= 0) { | |
1433 | data->length = res; | |
1434 | res = 0; | |
1435 | } | |
1436 | ||
1437 | out: | |
4d0c8aea | 1438 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
1439 | return res; |
1440 | } | |
ba44cb72 | 1441 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 1442 | #endif |